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Byzantine Gladiolus

Gladiolus byzantinus (glad-ee-OH-lus bih-ZAN-tin-us)

Family: Iridaceae Non-native Herbaceous (3-15 ft)

Byzantine gladiolus is a perennial bulb in the sword lily (Iridaceae) family that is native to the Mediterranean region of Europe and Africa. The genus name comes from the Latin word gladius meaning sword in reference to the leaves. The plant can grow up to 3 feet tall with showy spikes of magenta to purple tubular flowers that are more orchid-like rather than like the modern glads. The long sword-shaped leaves grow in a fan shape The showy flowers are in clusters of up to 15 blooms and appear in late spring to early summer. Plants prefer fertile well-drained soil in full sun but tolerate some shade. Plant corms about 3-4 inches deep in fall and about 6-8 inches apart in groups of 5-7. Once flowering has stopped, allow the foliage to grow until it starts turning yellow to provide energy to the corms for the following year. In colder climates the corms need to be dug up in fall, dried and stored in a cool place until spring. Use this plant in naturalized areas, borders, groups, English gardens or cottage gardens. This plant was a favorite in the old south and can still be found growing in old cemeteries, abandoned home sites, and ditch banks. In 1993 it was awarded the prestigious Award of Garden Merit by the Royal Horticulture Society. In 2006 it was named the Heirloom Bulb of the Year. Insects, Diseases, and Other Plant Problems: No significant problems. Watch for fusarium rot, gray mold (Botrytis), aster yellows and rust. Thrips can cause significant problems. Aphids may appear. Taller flowering stems appreciate staking or support to prevent falling in winds. VIDEO Created by Elisabeth Meyer for "Edibles, Bulbs, and Houseplants", a plant identification course developed in partnership with Longwood Gardens. More information on Gladiolus .

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 56 attributes.

How it fits the guild

Guild layer 4 - Herbaceous (3-15 ft)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Fills a similar niche Helleborus orientalis Iris x germanica Rhododendron Encore® Group

Full plant profile

Growing Conditions
Plant type
Bulb; Herbaceous Perennial; Perennial
Life cycle
Bulb
USDA zones
6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b
Light
Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil drainage
Good Drainage | Moist
Available space
Less than 12 inches; 12 inches-3 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 1 ft. 0 in. - 3 ft. 0 in. | Width: 0 ft. 8 in. - 1 ft. 6 in.
Growth rate
Medium
Maintenance
Low
Canopy layer
4 - Herbaceous (3-15 ft)
Form & Appearance
Habit / form
Clumping; Dense; Erect
Texture
Medium
Leaf color
Green
Leaf type
Simple
Leaf arrangement
Rosulate
Leaf shape
Lanceolate; Linear
Leaf margin
Entire
Leaf feel
Smooth
Leaf size
> 6 inches long, < 1 inch wide
Hairs present
No
Leaf detail
Sword-shaped leaves are up to 12 inches long and 1 inch wide and grow in a fan shape with 3-5 leaves.
Flower color
Pink; Purple/Lavender; Red/Burgundy
Flower value
Edible; Fragrant; Good Cut; Showy
Flower form
Raceme; Spike
Flower shape
Funnel
Flower size
1-3 inches
Flower detail
6-parted flowers that grow on one side of a spike (secund) in a raceme of up to 15 flowers. Blooms May-July
Bloom time
Spring; Summer
Fruit color
Brown/Copper; Green
Fruit type
Capsule
Fruit detail
Capsule dries to split open. Initially green and matures to brown
Stem color
Green
Stem detail
Tall green leafless stems
Wildlife & Ecology
Native status
Non-native
Origin
Southern Europe, northern Africa
Wildlife value
Butterflies and hummingbirds may visit the flowers
Attracts
Butterflies; Hummingbirds
Food & Medicine
Fruit type
Capsule

Edibility

The bulb is edible and was used during a famine to make flour.

Landscape Use
Landscape location
Meadow; Naturalized Area
Landscape theme
Cottage Garden; English Garden
Design feature
Border; Small groups
Garden tags
#problem for horses #problem for dogs #problem for cats #herbaceous perennial #bulb #red flowers #showy flowers #naturalized area #summer flowers #full sun #spring flowers #purple flowers #border back #border middle #perennial
Problems & Resistance
Insect problems
Flower Thrips; Aphids Found on Flowers and Foliage; Bulb Mites
Disease problems
Southern Blight of Herbaceous Ornamentals
Problems
Problem for Cats; Problem for Dogs; Problem for Horses
Propagation
Division

Planted at Hunnicutt

Nobody’s planted this one yet.